diff --git a/libraries/AP_ServoRelayEvents/AP_ServoRelayEvents.cpp b/libraries/AP_ServoRelayEvents/AP_ServoRelayEvents.cpp
index 262e8a436b..d5484d01b5 100644
--- a/libraries/AP_ServoRelayEvents/AP_ServoRelayEvents.cpp
+++ b/libraries/AP_ServoRelayEvents/AP_ServoRelayEvents.cpp
@@ -36,6 +36,9 @@ bool AP_ServoRelayEvents::do_set_servo(uint8_t _channel, uint16_t pwm)
     {
     case SRV_Channel::k_none:
     case SRV_Channel::k_manual:
+    case SRV_Channel::k_sprayer_pump:
+    case SRV_Channel::k_sprayer_spinner:
+    case SRV_Channel::k_gripper:
     case SRV_Channel::k_rcin1 ... SRV_Channel::k_rcin16: // rc pass-thru
         break;
     default:
@@ -88,6 +91,9 @@ bool AP_ServoRelayEvents::do_repeat_servo(uint8_t _channel, uint16_t _servo_valu
     {
     case SRV_Channel::k_none:
     case SRV_Channel::k_manual:
+    case SRV_Channel::k_sprayer_pump:
+    case SRV_Channel::k_sprayer_spinner:
+    case SRV_Channel::k_gripper:
     case SRV_Channel::k_rcin1 ... SRV_Channel::k_rcin16: // rc pass-thru
         break;
     default: